ALIGNED ROTOR SYSTEM Russian patent published in 2011 - IPC B64C27/32 

FIELD: transport.

SUBSTANCE: invention relates to aircraft engineering, particularly, to helicopters with two aligned rotors of opposite rotation. Proposed system comprises reduction gear with two opposite-rotation shafts supporting rotor hubs, two inter-articulated axially displacing swash plates and articulated with blade driving elements and integrated control system of common and differential pitch. Rotor hubs have torsion blade attachment and ball-support horizontal hinges. Integrated lever system comprises two pairs of bell cranks and a slide. First pair of levers of arranged below lower swash plate, while second pair and slide are arranged on reduction gear bottom part. One of the levers of each pair is attached to reduction gear housing while the other is suspended thereto. Aforesaid slide is arranged inside reduction gear cylindrical chamber with its lengthwise axis aligned with top rotor shaft axis. Suspended levers of each pair are coupled with power swash plate and slide, respectively. Tie rods and rockers are used to joint suspended levers with differential level control link, while levers secured to reduction gear housing are coupled with common pitch control linkage. Top rotor control is made up of two-arm rockers fitted on top rotor shaft to move along its axis and articulated with the slide, top swash plate and blade driving elements.

EFFECT: higher flight safety, reliable operation of control system.

2 cl, 5 dwg